Magnetic blow-out



March 31, 1925. 1,532,038

E. R. CARICHOFF MAGNETI C BLOW-OUT Original Filed Feb. 27, 1920 IYW\/T\tOT", Eugene R. Camic hoff,

His bqttorn 6y.

Patented Mar. 31, 1925.

UNITED STATES 1,532,033 PATENT OFFICE.

EUGENE R. CARICHOFF, OF SCHENECTADY, NEW YORK, ASSIGNOR T GENERAL ELEC- TRIO COMPANY, A CORPORATION OF NEW YORK.

MAGNETIC BLOW-our.

Original application filed February 27, 1920, Serial No. 361,694. Divided and this application filed June 29, 1921. serial No. 481,422.

To all whom it may concern Be it known that I, EUGENEIR. CARIoHorr,

a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Magnetic Blow-Outs, of which the following is a specification. I

My invention relates to improvements in magnetic blow outs for disrupting the arcs formed between circuit interrupting contacts. The invention is directed to improvements whereby a reliable and effective magnetic blow out may be manufactured of a comparatively few simple parts which can be quickly assembled and disassembled.

This application is a division of my copending application Serial No. 361,694, filed February 27, 1920. v

For a better understanding of the invention, reference is had to the accompanying drawing in which I have shown an embodiment of the invention for purposes of illustration, and in which Fig. 1 is a side view of an electromagnetic switch in the closed position and provided with a magnetic blow out in accordance with my invention; Fig. 2 is a similar view showing the switch in the open position; and Fig. 3 is a detail showing a front view of the magnetic blow out.

The magnetic blowout for disrupting the arcs formed between thecircuit interrupting contacts 21 and 17 comprises a magnetic blow out electromagnet having a winding 27, one terminal of which is connected to the stationary contact 21 and the other terminal of which is connected to the terminal post 28. The'other terminal post 29 of the switch is connected to the wiping contact 17 by means of a flexible conductor 30. Metallic plates 31 and 32 which serve as pole pieces for the winding are clamped to the ends of the winding by means of a bolt 27 and a block of insulating'refractory material 83, having a chute 34through which the vided so as to po 'tively hold thechute in proper position. Thus, an elongated pin 'or projection 35 is formed on the end of the arc chute and this projectioncooperates with a slot of similar shape in the pole piece. A similar pin and slot connection is provided on the other end of the arc chute. The are chute is preferably of a unitary construction as shown, having integral back and side portions, and the arrangement is preferably such that the arc chute is held between the ends of the pole pieces 31 and 32 so that the back portion of the arc chute is interposed between the blow out coil 27 and the circuit interrupting switch contacts. The arcs formed between the interrupting contacts are thus prevented from reaching the blow out coil, and the heat of the arcs is 1prevented from affecting the blow out coi Furthermore, the unitary construction of the arc chute lends itselfvery readily to large scale manufacture. When it is desired to remove the arc chute to replace the chute or to inspect the contacts, the bolt 27 is backed off slightly and the chute is then freely removable. The switch mechanism is mounted in a suitable base 10 of insulating material. The operating electromagnet for the switch comprises a winding 11 suitably supported within a frame of magnetic material 12, and the armature 13 is pivotally supported within the frame 12 so that the arms of the armature, of which only one can be seen, extend along the axis of the magnet winding 11. The projection 16 on the armature forms a support for the movable switch contact member 17. The contact finger 17 is given a wiping action with respect to the stationary contact 21 when the switch closes by means comprising the pin 22 which passes through a hole in the projection 16 and acorresponding hole in the finger, and a spring 23 which passes the contact toward the projection 16. The armature 13 is pivotally supported within the frame 12, embracing the winding 11, by means of a pin 24 which passes through holes in the projections on the legs of the armature and corresponding holes near the upper edges of the ends of the legs of the frame. The armature is therefore biased by gravity to the position shown in Fi' 2 and is operated to the attracted position to close the switch holding the other ends contacts upon the energization of the ma net winding 11, as shown in Fig. 1. ThlS operating electromagnet is claimed specifically in my said application, Serial Number 361,694, filed February 27, 1920.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and

carried out by between the are chute and the pole pieces,

and means passing through the coil for of said pole pieces to the coil and the arc chute between the pole pieces,

2. The combination in a magnetic blowout for electric switches, of a blowout coil, pole pieces therefor having openin s in their ends, a removable insulatmg are c ute having projections entering the openings in the ends of the pole pieces, and means passing through the coil for holdin one end of each pole piece to the coil an the arc chute between the other ends of the pole pieces.

3. The combination in a magnetic blow out for electric switches, of a blowout coil, pole pieces therefor having elongated slots in their ends, an insulating arc chute having correspondingly shaped projections entering the said slots in the ends of the pole pieces, and means passing through the said coil for holding one end of each pole piece to the coil and the are chute between the other ends of the pole pieces.

4. The combination in a magnetic blowout for electric switches, of a removable insulating arc chute having a projection on each side of the passage for the are, an electromagnet, a pair of pole pieces, each of which has a slot within which the corresponding projection in the arc chute enters, and One of which is secured to one end of the core of the electromagnet, and a bolt which screws into the other end of the core for holding the arc chute between the pole pieces and the other pole piece to the said core.

In witness whereof I have hereunto set my hand this 28th day of June, 1921.

EUGENE R. CARICHOFF. 

